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Fair Value (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment	$ 5,536	$ 7,338	$ 10,082
Commercial real estate, Owner occupied | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		23
Other real estate owned, 1–4 family residential | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		16
Commercial real estate, Farmland | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		339
Commercial, Agricultural | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		113
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial real estate, Owner occupied | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned, 1–4 family residential | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial real estate, Farmland | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial, Agricultural | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		0
Significant Other Observable Inputs (Level 2) | Commercial real estate, Owner occupied | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		0
Significant Other Observable Inputs (Level 2) | Other real estate owned, 1–4 family residential | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		0
Significant Other Observable Inputs (Level 2) | Commercial real estate, Farmland | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		0
Significant Other Observable Inputs (Level 2) | Commercial, Agricultural | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		0
Significant Unobservable Inputs (Level 3) | Commercial real estate, Owner occupied | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		23
Significant Unobservable Inputs (Level 3) | Other real estate owned, 1–4 family residential | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		16
Significant Unobservable Inputs (Level 3) | Commercial real estate, Farmland | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		339
Significant Unobservable Inputs (Level 3) | Commercial, Agricultural | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment		113
Residential Real Estate | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment	740	77
Residential Real Estate | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment	0	0
Residential Real Estate | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment	0	0
Residential Real Estate | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment	740	77
Consumer | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment	2	2
Consumer | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment	0	0
Consumer | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment	0	0
Consumer | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Recorded Investment	$ 2	$ 2

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

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